来自《耶鲁大学开放课程：心理学导论 第11集》

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  and the American South and the American North,
  北美和南美之间
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  have somewhat different emotional triggers
  (这些地区)的情感触发事件有所不同
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  and emotional baselines to respond to.
  并且情感的幅度也不一样
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  But at the same time, as Darwin well knew,
  但是同时 就像达尔文所著称的
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  emotions have universal roots
  情感在人所有的人类
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  that are shared across all humans and across many animals.
  甚至到许多动物之间是有普遍性的
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  So, the agenda for this class and the next class
  所以这节课和下节课的大致内容
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  is going to go like this.
  是这样的
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  First, I want to talk a little bit about facial expressions,
  首先我会讲一点面部表情
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  which are ways in which we communicate our emotions.
  这是我们交流情感的一个很重要的手段
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  not the only way, but an important way.
  不是唯一手段 但是是很重要的
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  and look, in particular, at the case of smiling
  然后特别的注意一下微笑这个表情